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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Try calling your function several times in a row in your IDE and it'll fail there too.
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Needs more examples, had code that worked on the current examples but not some of the test cases.